When you’re looking for the best grout to use outside, a high-quality epoxy grout is really the perfect choice. This is because epoxy grout is durable and resistant to weather. The Tile Doctor is the exclusive distributor of Litokol Starlike grout.

Flagstone refers to any flat, split stone, and may be made of granite, limestone or sandstone. No matter where flagstone is installed, grouting helps hold flagstone firmly in place and prevents dirt and debris from collecting between stones.

Don’t remove anything still attached, just focus on the bits and pieces around crumbling edges. Use a polishing tool with a soft pad to loosen even the tiniest chunks of dust and stone, then rinse off the surface to remove lingering particles from the flaking flagstone.

Thinset Mortar Large-bodied stones such as flagstone generally require a minimum trowel notch of 1/2-inch, which provides sufficient mortar for the flagstone to use as a bed.

How to Remove Stains From Flagstone Use a pressure washer on outdoor flagstone to blast away the stain. This will work on many types of stains but not oily, rust or chemical marks. Make a paste of a degreaser dish soap and rub it into the stain. Apply a stone cleaner and brightener according to the package directions.

How to Clean Mortar Residue Off Flagstone Put on your rubber gloves. Although an acid replacement won’t burn your skin, it may dry it out if it comes into contact with it. Remove as much of the mortar as you can using manual means. Scrape away as much as possible with a scraper. Wet down the area to be cleaned with a hose. Pour enough acid replacement on the mortar residue to cover it.